What is the approximate ASA rating of Rockland emulsions?
The ASA method does not apply, because Liquid Light and Ag-Plus emulsions are not panchromatic (sensitive to all colors) like black and white films, but sensitive only to blue light. If you are using emulsion in a camera as you might do for tintypes, place a blue acetate in front your exposure meter. Then you can be consistent from shot to shot, as you are measuring only blue light. Back to top How can I increase the contrast of the emulsion? You can get maximum contrast and density by sensitizing the emulsion with a small amount of developer. One method is to add exactly one part of working developer (not concentrate) to 10 parts of emulsion before use. Sensitize only as much emulsion as you plan to use within one day, as the mixture will not keep. Another method is to sensitize the emulsion after coating and before before exposing. Immerse the object that has been coated with emulsion in working developer for 30 seconds, then drain and put it on the easel and expose it (this can be m